Adjustable guide shell



Jan. 22, 1929. 1,699,636 I I W. A. SMITH ADJUSTABLE GUIDE SHELL Filed Nov. 5. 1926 ri J,"

I INVENTOR. w mlh'aml'miffi.

BY I I r Ms AT RNEY" Patented Jan. 22, 1929.

UlTED STATES PATENT OFFICE.

WILLIAM A. SMITH, OF SAYRE, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION 013 NEW JERSEY.

ADJUSTABLE Application filed November This invention relates to rock drills but more particularly to shells for rock drills and especially to means for effectively taking up wear upon the shell.

It is an object of this invention to enable a rock drill shell to be adjusted in a simplified manner and to compensate for wear by a construction which will not be materially heavier than the ordinary type of shell.

Other objects and advantages of the invention will appear hereinafter.

In the drawing,

Figure 1 is a longitudinal elevation of a rock drill shell constructed in accordance with the practice of the invention,

Figure 2 is a cross section taken on the line 2-2 of Fig. 1, looking in the direction of the arrows, and

Figure 3 is an end view of the shell with a section of part of the rock drill in place.

Referring to the drawing, the rock drill shell A is provided with a pair of shell caps oppositely arranged. Each shell cap comprises a top plate B and a wearing plate 0. A flange D of the top plate B has a face E cut at an angle of 45 substantially and cooperates with a similar face F cut at an angle of upon the shell A. Bolts G passin through lugs H of the top plates or caps 30 and lugs J on the base of the shell A serve to hold the top plates securely in place relative to the base of the shell A.

Shims K are interposed between the top plate flange D and the shell A. In adjusting the shell to compensate for wear, one or more of the shims K can be removed and the GUIDE SHELL.

5, 1926. Serial No. 146,426.

top plate B again bolted in position. The removal of one or more of the shims K compensates for both vertical and lateral wear.

I claim wear.

taneous lateral adjustment for taking up 2. In a rock drill the combination of a wearing plate, and a top plate, round bolt holes passing through said wearing plate and said top plate, bolts passing through said bolt holes, and one or more removable shims placed between the top plate and the wearingplate, removal of one or more of said shims causing wear to be taken up simultaneously laterally and vertically.

3. In a shell for rock drilling machines the combination of a wearing plate and a top plate having their adjoining faces bevelled at an angle, a plurality of removable shims placed between said bevelled faces, round bolt holes passing through said wearing plate and said top plate, bolts passing through said bolt holes, the removal of one or more of said shims causing wear to be taken up laterally and vertically.

In testimony whereof I have signed this specification.

WILLIAM A. SMITH. 

